{"id":"CVE-2026-112880","revision":null,"records":[{"revision":"1f647aafcdbd4bdc8f334203bb8366c4","observedAt":"2026-10-26T16:35:30.797+00:00","statement":{"source":"cve-program","id":"CVE-2026-112880","aliases":[],"title":"CRLF injection in Proxy-Authorization header built from proxy_auth_fun in hackney","description":"Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') vulnerability in hackney_http_connect in benoitc hackney allows HTTP Request Splitting via the value a proxy_auth_fun callback returns. After a 407 response from an HTTP CONNECT proxy, hackney_http_connect:handle_proxy_auth/11 calls the caller's proxy_auth_fun with the status code and the response headers and writes the returned binary into the Proxy-Authorization line of the CONNECT retry without checking it. A CR, LF or NUL byte in that value adds header lines to the request sent to the proxy.\n\nThe value is attacker-influenced when the callback derives it from untrusted data, for example from the proxy's challenge headers. Other caller-supplied values on the CONNECT path, such as the target host and the request headers, were already checked for control bytes.\n\nThis issue affects hackney: from 2.0.0 before 4.9.0.","state":0,"publishedAt":"2026-10-26T13:48:46.589+00:00","modifiedAt":"2026-10-26T15:35:50.632+00:00","affected":[{"ecosystem":"https://repo.hex.pm","name":"hackney","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://repo.hex.pm\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"hackney_http_connect\"\n                    ],\n                    \"packageName\": \"hackney\",\n                    \"packageURL\": \"pkg:hex/hackney\",\n                    \"product\": \"hackney\",\n                    \"programFiles\": [\n                        \"src/hackney_http_connect.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"hackney_http_connect:connect/4\"\n                        },\n                        {\n                            \"name\": \"hackney_http_connect:do_handshake_with_auth/9\"\n                        },\n                        {\n                            \"name\": \"hackney_http_connect:handle_proxy_auth/11\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/benoitc/hackney\",\n                    \"vendor\": \"benoitc\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"4.9.0\",\n                            \"status\": \"affected\",\n                            \"version\": \"2.0.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://github.com","name":"benoitc/hackney","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"hackney_http_connect\"\n                    ],\n                    \"packageName\": \"benoitc/hackney\",\n                    \"packageURL\": \"pkg:github/benoitc/hackney\",\n                    \"product\": \"hackney\",\n                    \"programFiles\": [\n                        \"src/hackney_http_connect.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"hackney_http_connect:connect/4\"\n                        },\n                        {\n                            \"name\": \"hackney_http_connect:do_handshake_with_auth/9\"\n                        },\n                        {\n                            \"name\": \"hackney_http_connect:handle_proxy_auth/11\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/benoitc/hackney\",\n                    \"vendor\": \"benoitc\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"5ee7d7d19eba27e774667d472feb1e93a08af7f9\",\n                            \"status\": \"affected\",\n                            \"version\": \"5df5a74a2817d5b12880d217db33253ff1fae1b5\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N","score":2.1,"severity":"LOW"}],"references":["https://github.com/benoitc/hackney/releases/tag/4.9.0","https://cna.erlef.org/cves/CVE-2026-112880.html","https://osv.dev/vulnerability/EEF-CVE-2026-112880","https://github.com/benoitc/hackney/pull/989","https://github.com/benoitc/hackney/commit/5df5a74a2817d5b12880d217db33253ff1fae1b5","https://github.com/benoitc/hackney/commit/5ee7d7d19eba27e774667d472feb1e93a08af7f9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-112880","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-112880","identifiers":["CVE-2026-112880"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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